My experience is, if someone asks you to do anything free, that's what it is worth to them.

Russ [/quote]

That's a great line I will remember. I have done free gigs for Charities and friends and it's always been appreciated .
I think I've over thought this and if it comes up I will just talk to the Treasurer in private and state my case. He's a good guy and will understand. As others have said its not worth the stress.